用简便方法计算. 7.19-1.8-4.2 103×70 &nbs...
用简便方法计算.7.19-1.8-4.2103×7019.22×99+19.22125×446800÷25÷42.82+0.04+0.96+7.28....
用简便方法计算. 7.19-1.8-4.2 103×70 19.22×99+19.22 125×44 6800÷25÷4 2.82+0.04+0.96+7.28.
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①7.19-1.8-4.2
=7.19-(1.8+4.2)
=7.19-6
=1.19;
②103×70
=100×70+3×70
=7000+210
=7210;
③19.22×99+19.22
=19.22×(99+1)
=19.22×100
=1922;
④125×44
=125×4×11
=500×11
=5500;
⑤6800÷25÷4
=6800÷(25×4)
=6800÷100
=68;
⑥2.82+0.04+0.96+7.28
=(2.82+7.28)+(0.04+0.96)
=10.1+1
=11.1.
=7.19-(1.8+4.2)
=7.19-6
=1.19;
②103×70
=100×70+3×70
=7000+210
=7210;
③19.22×99+19.22
=19.22×(99+1)
=19.22×100
=1922;
④125×44
=125×4×11
=500×11
=5500;
⑤6800÷25÷4
=6800÷(25×4)
=6800÷100
=68;
⑥2.82+0.04+0.96+7.28
=(2.82+7.28)+(0.04+0.96)
=10.1+1
=11.1.
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