64 × 42% +0, 42 × 28 − 1, 6 × 4, 2 + - 42/100 × 24
= 64 × 0, 42 +0, 42 × 28 − 1, 6 × 10 × 0, 42 + 0, 42 × 24
= 64 × 0, 42 + 0, 42 × 28 – 16 × 0, 42 + 0, 42 × 24
= 0, 42 × (64 + 28 − 16 +24)
= 0, 42 × 100
= 42

64 × 42% +0, 42 × 28 − 1, 6 × 4, 2 + - 42/100 × 24
= 64 × 0, 42 +0, 42 × 28 − 1, 6 × 10 × 0, 42 + 0, 42 × 24
= 64 × 0, 42 + 0, 42 × 28 – 16 × 0, 42 + 0, 42 × 24
= 0, 42 × (64 + 28 − 16 +24)
= 0, 42 × 100
= 42

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Hok tốt

163 g + 28 g = 191g

50 g x 2 = 100g

42 g – 25 g = 17g

96 g : 3 = 32g

100 g + 45 g – 26 g = 119g.

163 g + 28 g = 191g

50 g x 2 = 100g

42 g – 25 g = 17g

96 g : 3 = 32g

100 g + 45 g – 26 g = 119g

ủng hộ mình lên 220 nha các bạn

Tính nhanh :

\(a.1+2+3+...+98+99+100\)

\(=\left(100+1\right).100:2\)

\(=101.100:2\)

\(=10100:2\)

\(=5050\)

\(b.16.48+8.48+16.28\)

\(=48.\left(16+8\right)+16.28\)

\(=48.24+16.28\)

\(=1152+448\)

\(=1600\)

\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\{35}\end{array}}\\\hline{\,\,\,\,63}\end{array}\)                      \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{63}\\{28}\end{array}}\\\hline{\,\,\,\,35}\end{array}\)                     \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{63}\\{35}\end{array}}\\\hline{\,\,\,28}\end{array}\)

\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{42}\\{49}\end{array}}\\\hline{\,\,\,\,91}\end{array}\)                     \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{91}\\{42}\end{array}}\\\hline{\,\,\,49}\end{array}\)                       \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{91}\\{49}\end{array}}\\\hline{\,\,\,\,42}\end{array}\)